JPH0568246B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a filter body in which upper and lower filters are stretched over the bottom of a cup-shaped filter body, and a coffee storage section in which coffee powder is sealed is provided. This invention relates to a drip type coffee filter that extracts coffee liquid by passing hot water poured into the main body through this storage part.

[Prior Art] Filters containing coffee powder have been widely known.

Conventionally known general filters consist of a cup-shaped filter body with paper filters attached to the top and bottom of the bottom, and a coffee storage section containing the required amount of coffee powder. This filter is placed on a suitable container such as a coffee cup, and then boiled water is poured into the filter body and passed through the storage section to extract coffee liquid.

Some of these conventional coffee filters have a coffee storage part with the above-mentioned filter attached to the bottom of the filter body, and others have a coffee storage part formed separately from the filter body. There is a cartridge type that has this storage section removably attached to the bottom of the filter, but in both types, basically, the hot water poured into the filter body is passed through the coffee powder sealed in the storage section. They are the same in that they extract coffee liquid.

By the way, this filter has a filter transmittance of
Although the concentration of the extracted coffee liquid is made to be constant depending on the opening area, the amount of coffee powder enclosed, etc., in reality there is some variation, making it difficult to obtain a uniform concentration. On the other hand, although these conventional filters attempt to homogenize the coffee liquid within a certain concentration range by specifying the filter used and making the opening area constant, It had become impossible to further change the shading.

For this reason, a coffee filter was proposed that was equipped with a valve that changed the opening area at the bottom of the coffee storage section, that is, the drip opening, to adjust the flow rate and change the concentration of the extract. .

[Problems to be Solved by the Invention] As mentioned above, several proposals have been made regarding coffee filters that drip coffee liquid directly into a container such as a coffee cup by pouring hot water into the filter. being done. However, with all conventional filters, the extraction concentration varies, resulting in slight differences in taste each time, while filters equipped with a concentration adjustment means such as a valve at the dripping port do not allow accurate extraction according to the operation. It was not possible to obtain a concentration change, and the operation adjustment had to be made based on the premise of rough adjustment.

The present invention has been researched and developed in view of such conventionally proposed coffee filters, and its purpose is to always obtain a constant concentration, and also to adjust the desired concentration according to the taste of the drinker. To provide a coffee filter that allows the concentration to be set accurately.

Conventionally, in order to make the concentration of extracted coffee liquid uniform, one thing is to make the amount of coffee powder sealed constant, the filters used are uniform, and the third thing is to make the opening area of the dripping port constant, etc. By adjusting the permeation rate of hot water and keeping it constant to make the concentration uniform, it is possible to adjust the amount of coffee powder enclosed,
Although it is possible and easy to adjust the opening area, adjusting the amount of transmission through the filter is not always easy and is unstable.

The density adjustment by this filter is by coarseness,
This is done by selecting the material such as thickness, but in this type of filter, water drains from the bottom of the filter after passing through the filter, and it is not uniform due to the speed of falling, and experimental results show that filters made of the same material It was found that there were differences in the extraction speed and concentration even when using the following methods.

[Means for Solving the Problems] Focusing on the above-mentioned points, the present invention provides a bottom plate under the filter that is stretched below the coffee storage section, and allows the extracted coffee liquid to flow between the bottom plate and the filter. A reservoir chamber is provided, and on the other hand, a transmission hole of a predetermined diameter is opened in the bottom plate, and the hot water, that is, the coffee liquid, which is poured into the filter body, passes through the coffee powder in the storage section, and extracts the coffee components, is temporarily stored in this reservoir chamber. By filling the base plate with water and gradually dropping it through the permeation holes provided in the bottom plate, extracted coffee liquid can be obtained at a constant rate.

That is, in the present invention, when the extracted coffee liquid passes through a conventional filter and drips, water droplets are formed on the lower surface of the filter due to surface tension, and when these droplets grow to a predetermined size, they fall down repeatedly. This was done in view of the non-uniform filtration rate caused by the uneven growth of water droplets in the filtration action, and the coffee liquid that has passed through the filter is temporarily stored in a reservoir, thereby eliminating the formation of water droplets in the coffee liquid. The purpose is to promote smooth permeation at a constant rate, and to determine the actual contact time between hot water and coffee powder by the permeation holes formed in the bottom plate, making it possible to always extract at a stable concentration.

Furthermore, in view of the constant flow rate from the above-mentioned permeation holes, the present invention provides a plurality of permeation holes in the bottom plate, and these permeation holes are used with peelable or removable seals or plugs. It is an object of the present invention to provide a coffee filter in which the concentration can be freely selected by selectively opening the seal or stopper and selecting the opening area of the permeation holes.

[Function] According to the present invention, the hot water poured into the filter body flows into the coffee powder through the filter above the storage part and comes into contact with it, extracting the coffee components, and leaves the coffee as it is. According to the flow, it falls through a lower filter, but in the present invention, it does not fall directly from this lower filter into a container, but is stored in a reservoir provided below,
After it is filled, it will be poured into the container through a permeable hole in the bottom plate on the lower side of the container. and,
During this time, the hot water is stored inside the reservoir by the reservoir, and at the same time, it accumulates in the storage section to maintain contact with the coffee powder and effectively work on extracting the ingredients.
Since the diameter of the permeation hole, that is, the opening area is kept constant, the flow rate is constant, and therefore the residence time is constant, so that the concentration can be made constant.

[Embodiment] The illustrated embodiment shows an example of a coffee filter according to the present invention, and in FIGS. 1 to 4, 1 is a cup-shaped filter body; 2
indicates a coffee storage section provided at the bottom of this filter body.

The storage section 2 shown here is of a cartridge type and is formed separately from the filter main body 1, and is designed to be freely attached and detached to a cylindrical mounting section 3 provided at the bottom of the main body 1 during use. .

As shown in FIGS. 1 and 2 in detail, this storage section 2 is formed in the shape of a bottomed dish, and the upper opening is provided with two-stage flanges 4 and 5, and the lower inner flanges 4 are made of filter paper. A filter 6 is provided, and a sealing film 7 is provided on the outer collar 5. A diameter-reduced step 9 is provided at the lower end of the body following the bottom plate 8 that closes the bottom, and a lower filter 10 is stretched over the upper surface of this step, and a space is formed between the lower filter 6 and the lower filter 6. Coffee powder 11 is contained in the filter 10, and a reservoir 12 is provided between the lower surface of the filter 10 and the bottom plate 8.

The bottom plate 8 is sloped so as to be depressed toward the center, and three permeation holes 13a, 13b, and 13c with different diameters are provided in the most depressed center. A plurality of protrusions 14 are provided on the upper surface of the bottom plate 8 in a radial manner avoiding the above-mentioned transmission holes to support the lower surface of the filter 10 below.

15 in the figure is a transmission hole 13a, 1 opened in the bottom plate 8.
3b and 13c, the seal is removably attached to the lower surface of the bottom plate 8.

The storage section 2 has a dish-shaped main body formed of plastic, has upper filters 6 and 10 stretched over it, and encloses a required amount of coffee powder 11 inside.
Furthermore, a film 7 is attached to the upper opening and a seal 15 is attached to the lower surface of the bottom plate 8 to seal the interior and make it durable for storage.

When in use, the film 7 is peeled off to expose the upper filter 6, and then the seal 15 is adjusted to the desired concentration, for example, when a strong coffee is desired, the seal 15 closes the smallest diameter permeation hole 13c.
It is peeled off and opened, and in this state it is dropped into the filter main body 1 from above, attached to the attachment part 3 formed at the bottom of the filter body 1, assembled, and placed on a container 16 such as a coffee cup.

Figure 4 shows the state in which coffee liquid is extracted by pouring hot water into the main body 1 after placing it on the container 16, and the poured hot water flows through the filter 6 at the top.
flows into the enclosed coffee powder 11 to extract the coffee components, and the hot water from which the components were extracted, that is, the coffee liquid, flows through the filter 1 below.
0 and falls into the storage chamber 12, where it is temporarily stored, and then through the bottom plate's transmission hole 13c (or 13a, 1
3b) into the container 16.

The poured hot water becomes coffee liquid in the above order, but it passes through the filter 10 and is stored in the reservoir 12, and as the flow is stagnant, the hot water that does not pass through the filter comes into contact with the coffee powder 11. This will ensure sufficient extraction of the components. The coffee liquid stored in the reservoir chamber 12 falls into the container at a speed determined by the opening area of the opened permeation hole 13c, regardless of the permeation speed of the filter 10.

In this way, the filter of the present invention stores the permeated coffee liquid in the reservoir chamber 12 provided under the lower filter, and the actual filtration rate of the liquid is adjusted by the opening area of the permeation hole provided in the bottom plate. , it has become possible to set the concentration extremely accurately, and when there is only one hole, a uniform concentration can always be obtained within this range, and when there are multiple holes, the actual concentration can be determined by selecting the opening. By peeling off the seal 15, an accurate concentration can be selected.

In addition, the bottom plate 8 has a transmission hole 13a with a diameter of 3 mm, and a diameter
1.5mm transmission hole 13b and 1.2mm diameter transmission hole 13
When the coffee liquid was extracted by sequentially opening the large-diameter ones, it took about 1 minute and 30 seconds for the hole 13a and about 2 minutes for the hole 13b to be opened.
30 seconds, approximately 3 minutes for the smallest diameter hole 13c
Each time required 30 seconds, and changes in light, medium, and dark concentrations were confirmed. Furthermore, it was confirmed that these permeation times were approximately constant in repeated experiments several times.

By the way, FIGS. 5 and 6 show the bottom plate 8 of the storage section 2.
This figure shows another example of a seal that is attached to the lower surface of the device and closes the transmission holes 13a, 13b, and 13c.

The seal 17 shown here is formed in a circular shape to match the shape of the bottom plate 8, and is pasted so as to cover the entire surface of the bottom plate.
When opening the transmission hole, the part corresponding to the transmission hole to be opened is turned over as shown in the figure, and cut and peeled along the perforation line 18 previously formed for cutting. This is the case. In order to make it easier to peel off the target part when peeling off the seal, here, a recess 19 is provided in a part of the peripheral edge of the bottom plate 8 of the storage section so that the tip of the finger can be easily hooked thereon.

Furthermore, FIG. 7 shows another embodiment in which a dish-shaped bottomed storage section 21 is integrally provided at the bottom of the filter main body 20 in place of the cartridge type storage section 2 of the previous embodiment. An upper filter 23 is placed on the lower step 22 of the stepped bottom of the main body, which corresponds to the connection between the storage section and the main body, and a film 25 is placed on the upper surface of the upper step 24.
On the other hand, a lower filter 27 is provided on the step 26 provided in a diameter-reduced manner at the lower end of the storage, and coffee powder 2 is placed between it and the upper filter 23.
8 is enclosed, and a reservoir 30 is provided between it and the lower bottom plate 29, and the bottom plate 29 is provided with a predetermined permeation hole 31 as in the previous embodiment, and this permeation hole is attached to the lower surface of the bottom plate. It is closed with a seal 32.

This embodiment differs from the cartridge type only in that the storage section 21 is molded integrally with the main body 20, but is otherwise formed the same.When in use, the stretched film 25 is removed for sealing. Then, the target seal 32 is peeled off and placed on a container for use.

In the figure, numeral 33 is a protrusion for preventing the lower filter 26 from hanging down, and numeral 34 is a peeling tab.

By the way, in the above-mentioned two embodiments, the transparent hole formed in the bottom plate of the storage part is made of a removable seal 1.
5 and 32, and when used, it is pulled out and opened. However, instead of using this seal method, a stopper may be fitted and closed, and when used, it can be pulled out and opened. The means for closing the hole may be used in place of the usual means for closing and opening the drilled hole.

In addition, especially in the case of blocking with a peelable seal, the permeation hole is enlarged in advance, and the opening area of the permeation hole is selected by selecting the rate of peeling of the seal, and the concentration is increased. It is possible to make changes to.

[Effects of the Invention] As explained above based on the embodiments, the filter of the present invention includes a reservoir having a required space between the filter below the coffee storage section and the bottom plate of the storage section,
In addition to this, the device is characterized by having a permeation hole at the bottom of the storage section.According to the present invention, the coffee liquid that has passed through the filter is temporarily stored in the reservoir and is not allowed to drip directly into the container. The system is designed so that it is not affected by the amount of permeation through the filter, and the extraction speed of the coffee liquid depends solely on the diameter of the permeation hole in the bottom plate, so a constant extraction speed can be obtained and a stable concentration can be set. Summer.

Further, according to the present invention, the extraction speed can be set arbitrarily by changing the opening area of the above-mentioned permeation holes. Therefore, by opening a plurality of permeation holes and selectively opening them, the extraction speed can be set arbitrarily. It has the advantage of being able to change the concentration of extracted coffee liquid and accurately determining the concentration.

In addition, in the filter of the present invention, as the coffee liquid is temporarily stored in the reservoir chamber, the hot water passing through the storage portion reliably comes into contact with the coffee powder stored between the filters, and a condition is created in which the hot water temporarily stagnates. Therefore, it has the advantage of being able to penetrate evenly and extract coffee components efficiently.

Of course, in the present invention, the transmittance of the filter does not affect the extraction concentration, so there is more freedom in selecting the material compared to conventional coffee filters, and the quality is not affected by the tension of the filter. It is advantageous in terms of management.

On the other hand, the filter of the present invention is effective in preventing oxidation of coffee powder and has a long shelf life since the inside of the storage compartment can be completely sealed by closing the permeation hole with a seal or plug and covering the upper filter with a film. It has great advantages.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention.
The figure is a central vertical sectional view of the main part, Figure 2 is a plan view of only the main body of the storage unit, Figure 3 is a bottom view of the upper figure, Figure 4 is a vertical front view showing the state of use, and Figure 5 is another implementation. FIG. 6 is a partially enlarged vertical cross-sectional view of the above figure, and FIG. 7 is a vertical cross-sectional view of another embodiment. 1... Filter body, 2... Coffee storage section, 6
... Upper filter, 8 ... Bottom plate of storage section, 10
... lower filter, 11 ... coffee powder,
12...Reservoir chamber, 13a, 13b, 13c...Transmission hole, 14...Protrusion, 15...Seal.

Claims (1)

[Scope of Claims] 1. A filter is formed as a separate body in which a filter is stretched on both upper and lower surfaces of a mounting portion formed at the bottom of a cup-shaped filter body, and a required amount of coffee powder is pre-filled inside. A coffee filter is provided with a removably attached coffee storage section, wherein a bottom plate is formed in the shape of a dish at the bottom of the storage section, and the lower filter is stretched above the bottom plate at a required interval. A reservoir for extracted coffee liquid is formed between the levers, and a permeation hole of a required diameter is opened in the bottom plate,
On the other hand, a coffee filter characterized in that a seal is attached to the permeable hole and a film is attached to the upper opening of the coffee storage section so that the inside of the storage section can be sealed. . 2. The coffee filter according to claim 1, wherein the coffee filter has a plurality of permeable holes. 3. The coffee filter according to claim 1, wherein the plurality of permeable holes have different diameters. 4. The coffee filter according to claim 1, wherein the plurality of transmission holes are three with different diameters: large, medium, and small.